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Закрити книгу / close this bookAbstracts on Sustainable Agriculture (GTZ; 1992; 423 pages)
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts On Traditional Land-Use Systems
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on farming systems research and development
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on integrated systems
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on cropping system
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on agroecology
Закрити папку / close this folderAbstracts on agrometeorology
Перегляд документу / View the documentAcknowledgements
Перегляд документу / View the document1. Air pollution and agriculture.
Перегляд документу / View the document2. The greenhouse effect and primary productivity in european agro-ecosystems.
Перегляд документу / View the document3. Vegetation and the atmosphere:
Перегляд документу / View the document4. Microclimate: the biological environment.
Перегляд документу / View the document5. Microclimate management by traditional farmers.
Перегляд документу / View the document6. Environmental stress in plants.
Перегляд документу / View the document7. The impact of climate variations on agriculture.
Перегляд документу / View the document8. Drought spells and drought frequencies in west-Afrika (durée et fréquence des périodes séches en Afrique de l'ouest.)
Перегляд документу / View the document9. Potential effects of global climate change on cool season food legume productivity
Перегляд документу / View the document10. Weather and rice.
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on agroforestry
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on homegardens
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on seed production
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on plant protection
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on water management
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on soil fertility
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on erosion and desertification control
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on potential crops for marginal lands
 

8. Drought spells and drought frequencies in west-Afrika (durée et fréquence des périodes séches en Afrique de l'ouest.)

ICRISAT Research Bulletin No. 13, ISBN 92-9066-182-8, 1991, Order Code RBE 013; LDCs: USD 14.31, HDCs: USD 33.11; Bilingual: English, French

This publication is bilingual (English and French). Recurring droughts and decreased agricultural productivity during the last two decades in West Africa have pointed to the need for a clearer understanding of the length of dry spells, their frequencies and probabilities. A comprehensive review of various definitions of droughts has been presented to develop the basis for analysis of droughts. Using the specific definition of onset of rains in each year as the sowing date, the length of dry spells was calculated from the historical rainfall data for 150 stations located in Burkina Faso, Mali, Niger, and Senegal.

The relationships between mean annual rainfall and average frequency of dry spells for the selected locations in West Africa showed distinct patterns and permit the prediction of the frequency of dry spells from annual rainfall totals. Applications of dry-spell analysis for the choice of a crop/variety, supplemental irrigation, and crop water requirements have been described with examples.

1159 92 - 6/38

Agrometeorology

Syria, Israel, Netherlands, study, faba beans, climate change, temperature rise, CO2 increase, yield stability, ecology

GRASHOFF, C. et al.

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